Valve-stem guide



Jan. s, 1929. 1,697,847

VV;l4.ENCIE VALVE STEM GUIDE File u'ne 0, 1927 Patented Jan. 8, 1929.

UNITE@ WALTER II. Bion, or DETROIT, MICHIGAN.

l VALVE-STEM GUIDE.

Application filed June 50,

My invention relates to a new and useful improvement in a valve stem guide adapted for use with internal combustion engines in which the valve is moved axially against the tension of a spring by a push rod. With the usual type of internal combustion engines the valve stem is not guided at its free end or the end which is enga-ged bythe push rod, t-he only guide being positioned in proximity to the head. The result is that the spring in seating the valve often moves the valve out of its normal position because of the freedom of the end of the valve stem to move into various positions. The result is an ury to the engine, to the valve, an improper seating of the valve and a lowering of the eiiiciency of the engine.

To overcome these diiiiculties and provide a means for guiding the. valve stem in its movement so that it is retained in one path of movement is an object of t-he present invention.

In the operation of. these valves, the spring often when compressed, buckles, serving to move the valve stem out of its position, and it is an object of the present invention to provide a device whereby the buckling of the spring may be overcome.

Another object is the provision of a valve stem guide which will form a continuance of the push rod guide and serve to retain the valve stein in its proper path of travel.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

llhe invention will be best understood by a reference to the accompanying drawings which form a part of this specification and in which,

Fig. 1 is a transverse sectional view through a. motor embodying one form of the invention.

Fig. 2 is a longitudinal fragmentary sec-l tional view through a motor embodying one form of the invention.

Fig. 3 is a sectionalview taken on line 3-3 of Fig. 2.

Fig. 4 is a fragmentary view similar to Fig. 2 of a modified form of the invention.

Fig. 5 is a Sectional view taken on line 5 5 of Fig. 4.

Fig. 6 is a. fragmentary view similar to Fig. 1 of a furt-her modified form.

ln the drawings I have illustrated the cylinder 9 in which is slidably mounted the garanti seien.

1927. serial No. 202,530.

piston 10, this piston being connected by the connecting rod 11 to the crank shaft 12 which is positioned in the crank case 13, this structure being ofthe usual type. The valve head 14 is adapted to seat on thefseat 15 and provided with'a stem 16'about which is positioned in embracing relation the spring 17. A cam shaft 18 is provided with a cam 19 adapted to engage the push rod 20 which extends through the push rod guide 21 and is adapted to engage the lower end of the valve stem 16. The invention consists in asleeve 22 which is positioned about the valve stem 16 and interiorly of the spring 17. This sleeve is provided with a peripheral flange 23 to engage the lower end of the Spring 17, a suitable pin or key 24 retaining the sleeve 22 in position on the valve stem 16. A head 25 is mounted on the push rod guide 21 through which the valve stem projects, this valve stem engaging in a socket 26 formed in the upper end of the push rod 20. An opening 27 is formed in the side of the push rod guide 21 for permitting access to the lower end of the valve stem within the push rod guide 21.

lVith this form of a device mounted on the engine it is clear ,that the valve stem, since it never extends above the head 25, cannot be moved out of its proper alignment, and a true seating 0f the valve head 14 on its seat 15 will always be effected. By pro* viding the sleeve 22 as a member to fill the core or center of the spring 17, abuclling of this spring is prevented.-

In the modifiedr form l have shown the sleeve construction as described and the upper end of the push rod guide 21 is threaded to receive a cup shaped member 28 through the base of which is eX- tended the valve stem 16. This cup shaped member serves the same function as t-he head 25, saving that it is an adapter and may be mounted on a push rod guide of various types of engines land need not be formed as a standard part of the push rod guide when cast.

ln the modified form shown in Fig. 6 the structure is similar to the form shown in Fig. 1 excepting that there is projected interiorlyof the spring 17 a sleeve 22 which is integral with and projecting `downwardly i and experience has proved that the results desired' are attained by the use of such a guide.

While I have illustrated and described the preferred form of my invention, I do not Wish to limit myself to the precise details of structure shown, but desire to avai] myself of such variations and modifioations as. come Within the scope of the appended claim.. Y

t Having thus deseribedy my invention what I claim as new and desire to seeure by Letters Patent is:

Av valve stern gudeof the class described VALTER H. RICE. 

